Leg unit for movable seating unit and movable seating unit

Abstract

The utility model relates to a leg unit used for a movable seat unit and the movable seat unit, the seat unit comprises a seat part, and the leg unit comprises a leg frame, a seat part and a supporting part. The leg frame at least comprises a pair of leg longitudinal beams longitudinally extending in the front-back direction of the seat unit and a leg cross beam transversely extending between the leg longitudinal beams; a pair of leg slide bars movable in a front-rear direction of the seat unit, in which the leg slide bars are used to attach a leg rest plate; wherein the leg slide bar is slidably connected to the leg frame such that the leg unit is switched between a retracted position, in which the leg rest plate is folded at the front end of the leg longitudinal beam, and an extended position, in which the leg rest plate is deployed forward relative to the leg longitudinal beam, and wherein the leg unit is moved between a retracted position, in which the leg rest plate is folded at the front end of the leg longitudinal beam, and an extended position, in which the leg rest plate is folded forward relative to the leg longitudinal beam. The leg unit is mounted under the seat part by means of the leg frame.

Description

Technical Field

[0001] The utility model relates to a leg unit for a movable seat unit. In addition, the utility model also relates to a movable seat unit. Background Art

[0002] Various movable seating units are known in the prior art, such as sofas or chairs with multi-position conversion capabilities. As people's living standards improve, the demand for comfort in sofas and chairs is also increasing. In known designs, movable seating units typically include a mechanical extension device, which allows them to be converted between a sitting position, a lounge position (or TV position), and a reclining position. When the seating unit is converted from the sitting position to the TV position, the footrest of the seating unit extends forward, and the angle between the backrest and the seat remains substantially unchanged. When the seating unit is converted from the TV position to the reclining position, the footrest is further forward and upward compared to the TV position, and the backrest reclines significantly. However, in existing movable chair designs, the leg extension device often utilizes a multi-link telescopic structure, resulting in a complex structure and cumbersome installation process. Furthermore, the complex connection structure also poses the risk of functional failure, such as kinematic interference between the leg unit, the seat unit, and the backrest unit. Utility Model Content

[0003] In view of this, the technical problem to be solved by the present invention is to provide a movable seat with a simpler structure and easier assembly.

[0004] In order to solve the technical problem, a leg unit for a movable seat unit is provided, wherein the seat unit includes a seat unit with a seat portion, wherein the leg unit includes:

[0005] - a leg frame comprising at least a pair of leg longitudinal beams extending longitudinally in the front-rear direction of the seat unit and a leg cross beam extending transversely between the leg longitudinal beams;

[0006] - a pair of leg sliding rods movable in the front-to-rear direction of the seat unit, wherein the leg sliding rods are used to attach the leg rest;

[0007] The leg sliding rod is slidably connected to the leg frame, so that the leg unit can be transformed between a retracted position and an extended position. In the retracted position, the leg rest is folded at the front end of the leg longitudinal beam, and in the extended position, the leg rest is unfolded forward relative to the leg longitudinal beam, and the leg unit is installed under the seat part with the help of the leg frame.

[0008] Compared to existing technologies, this leg unit abandons the traditional multi-link structure and instead utilizes a mating connection between a leg sliding rod and a leg frame. This simplifies the mechanical connection structure, achieving a simpler kinematic chain, and thereby reducing the risk of motion jamming and functional impairment. More importantly, the leg frame itself is form-stable, and the leg unit's movable components are slidably retained within it. As a result, the leg unit, as a modular, independent unit, can be widely applied to various types of seat units. This significantly expands the applicable scope of the movable leg unit, and it can even be installed in seat units that originally lack a movable leg structure.

[0009] In a preferred embodiment, both ends of the leg cross beam are fixedly connected to the leg longitudinal beam by welding, riveting or screwing. Alternatively, the leg cross beam and the leg longitudinal beam are constructed in one piece.

[0010] In a preferred embodiment, the leg longitudinal beam includes a leg guide portion, and the leg sliding rod is slidably supported in the leg guide portion. Preferably, the leg guide portion is configured as a through guide groove provided on the leg longitudinal beam, and the leg sliding rod includes at least one roller, and the roller is rollably engaged in the guide groove, so that the leg sliding rod is slidably supported in the leg longitudinal beam. Alternatively, the leg guide portion is configured as a guide rail provided on the leg longitudinal beam, and the leg sliding rod includes a slider, and the slider is shape-fittingly and movably engaged in the guide rail, so that the leg sliding rod is slidably supported in the leg longitudinal beam.

[0011] In a preferred embodiment, the leg rail includes at least one mounting tab, which connects the leg frame to the seat unit. Preferably, the mounting tab defines a mounting plane, with the leg guide extending obliquely relative to the mounting plane. This allows the leg slide bar to simultaneously lift upward as it slides forward, improving user comfort.

[0012] In a preferred embodiment, the leg unit further includes a legrest connecting rod arranged between the leg sliding rod and the legrest, wherein the legrest connecting rod is pivotally connected to the front end of the leg sliding rod and fixedly connected to the legrest.

[0013] In a preferred embodiment, the leg unit further comprises a reset member, wherein the reset member acts between the leg sliding rod and the legrest connecting rod, and the reset member can be used to cause the end of the legrest connecting rod facing away from the leg sliding rod to flip forward. During the process of the leg unit changing from the retracted position to the extended position, the leg sliding rod slides forward along the leg guide portion of the leg longitudinal beam, and the reset member causes the legrest connecting rod to flip forward together with the legrest. During the process of the leg unit changing from the extended position to the retracted position, the leg sliding rod slides backward along the leg guide portion of the leg longitudinal beam, so that the legrest is stopped by the front end portion of the leg longitudinal beam or the front end portion of the seat unit of the seat unit, thereby overcoming the reset force of the reset member and flipping backward. Preferably, the reset member comprises a torsion spring.

[0014] In a preferred embodiment, the leg unit further includes a leg actuator, which acts between the leg frame and the leg sliding rod, and the leg unit is transformed between the retracted position and the extended position by adjusting the leg actuator.

[0015] In a preferred embodiment, the leg unit further comprises a guide beam extending transversely between the pair of leg sliding rods, wherein the leg actuator acts between the leg beam and the guide beam.

[0016] Preferably, the leg actuator is configured as a linear actuator and includes a motor head, a motor guide rail, and a motor slider movable along the motor guide rail. Preferably, the motor head is hingedly connected to the leg crossbeam via a motor bracket. Alternatively, the motor slider is hingedly connected to the guide crossbeam via the motor bracket. Thus, the pivotable mobility of at least one end of the leg actuator reduces the precision required for the leg actuator's tilt angle during installation, achieving a simpler installation process.

[0017] In a preferred embodiment, the minimum thickness of the leg unit is no more than 10 cm.

[0018] The leg sliding rods are guided in the leg guides of the leg longitudinal beams along the sliding direction, and the aforementioned thickness is measured perpendicular to this guide direction. As previously mentioned, the leg guides can extend obliquely relative to the mounting plane. In this case, the thickness of the leg unit varies in this sliding direction, particularly decreasing from rear to front, with the minimum thickness typically at the front of the leg unit. Of course, the leg guides can also extend parallel to the mounting plane. In this case, the leg unit typically has a substantially constant thickness in the sliding direction.

[0019] According to this utility model, the minimum thickness of the leg unit is further reduced to 10 cm, thereby improving the compactness of the structure and making the leg unit, including the leg actuator, flat as a whole. This not only provides sufficient space under the seat unit for cleaning and maintenance, but also improves the visual experience, providing a more aesthetically pleasing design while ensuring good functionality.

[0020] In order to solve the technical problem, the utility model also relates to a movable seat unit, which includes the above-mentioned leg unit.

[0021] In a preferred embodiment, the seat unit comprises:

[0022] - base unit;

[0023] - a seat unit for attaching a seat portion;

[0024] The seat unit includes a pair of seat longitudinal beams extending in the front-rear direction of the seat unit, the seat portion is connected to the seat longitudinal beams via a seat frame, and the leg unit is connected to the seat frame.

[0025] In a preferred embodiment, the seat longitudinal beam is movable relative to the base unit in a front-rear direction of the seat unit.

[0026] In a preferred embodiment, the seat unit further includes an outer trim covering both the seat portion and the leg rest. When the leg unit is moved from the retracted position to the extended position, the outer trim is tensioned, thereby causing the leg rest to extend forward. Thus, the leg rest can be returned to its retracted position even without a separate return member.

[0027] In a preferred embodiment, the seat unit further comprises a backrest unit for attaching a backrest.

[0028] Preferably, the backrest unit is connected to the rear portion of the seat longitudinal beam and comprises a backrest bracket for attaching a backrest, wherein the backrest bracket is pivotally connected to the seat longitudinal beam to achieve tilting rotation of the backrest.

[0029] Preferably, the backrest unit further includes a first backrest link and a second backrest link, wherein the first backrest link is connected between the backrest bracket and the second backrest link, and the second backrest link is pivotally connected to the first backrest link, the seat longitudinal beam and the base unit respectively, so that when the seat longitudinal beam moves forward, the highest point of the backrest bracket moves forward.

[0030] In a preferred embodiment, the seat unit further comprises a seat actuator acting between the base unit and the seat unit, and the seat frame longitudinal beam is moved along the front-rear direction of the seat unit by adjustment of the seat actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] Figure 1 A perspective view schematically shows a seat unit according to the present invention;

[0033] Figure 2 Schematically shown Figure 1 a perspective view of the seat unit shown in a seated position;

[0034] Figure 3 Schematically shown Figure 1 A perspective view of the seat unit shown in the TV position;

[0035] Figure 4 Schematically shown Figure 1 a partial top view of the seat unit shown;

[0036] Figure 5 Schematically shows a side view of a leg unit according to the present invention;

[0037] Figure 6 Schematically shown Figure 5 a top view of the leg unit shown;

[0038] Figure 7 A perspective view schematically illustrates a leg unit according to an embodiment of the present invention, in a retracted position;

[0039] Figure 8 Schematically shown Figure 7 a perspective view of the leg unit shown in an extended position;

[0040] Figure 9 Schematically shown Figure 8 a side view of the leg unit shown;

[0041] Figure 10 A perspective view schematically illustrates a leg unit according to an alternative embodiment of the present invention, in a retracted position;

[0042] Figure 11 Schematically shown Figure 10 a perspective view of the leg unit shown in an extended position;

[0043] Figure 12 A partial perspective view schematically shows a leg unit according to an embodiment of the present invention;

[0044] Figure 13 schematically illustrates a perspective view of a seating unit according to an alternative embodiment of the present invention, in a sitting position; and

[0045] Figure 14 Schematically shown Figure 13 A perspective view of the seating unit shown in the TV position. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] References herein to "one embodiment" or "an embodiment" refer to specific features, structures, or characteristics that may be included in at least one implementation of the present invention. In describing the present invention, it should be understood that terms such as "upper," "lower," "left," "right," "top," and "bottom" are used to indicate orientations or positional relationships based on those shown in the accompanying drawings and are intended solely for ease of description and simplification. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation and are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of the technical features referred to. Thus, a feature designated "first" or "second" may explicitly or implicitly include one or more of the features. Furthermore, the terms "first," "second," and the like are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that such terms are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0048] Furthermore, it should be noted that the "front-rear direction" in this application refers to the extension direction of the leg units of a furniture unit, particularly a seat unit. Specifically, "front" refers to the direction toward the leg units, and "rear" refers to the direction toward the backrest unit. The "left-right direction" or "lateral direction" refers to the horizontal direction of a furniture unit, particularly a seat unit, that is perpendicular to the "front-rear direction."

[0049] Figures 1 to 4 The seat unit according to the present invention is shown as an example. Figure 1 As shown, the chair unit comprises a base unit 1, a seat unit 2, a backrest unit 3 and a leg unit 4. The chair unit is configured to be convertible between a sitting position, a TV position and a lying position.

[0050] exist Figure 1 and Figure 2 In the sitting position shown, the backrest (not shown) is upright and the leg unit 4 is in its retracted position; Figure 3 In the TV position shown, the leg unit 4 is extended forward, and in its extended position, the backrest remains essentially unchanged; in the lying position not shown, the leg unit 4 still maintains its extended position, the seat unit 2 moves forward and drives the backrest to tilt backward at a significant angle.

[0051] However, in embodiments not shown, the seating unit can also be switched only between a sitting position and a TV position, or only between a sitting position and a lying position.

[0052] Figures 1 to 4 as well as Figure 13 and Figure 14 The illustrated seat unit is a floor-mounted armrest seat unit, comprising an armrest portion (not specifically shown) that is attached to the base unit 1 on one hand and fixedly supported on the ground on the other hand, thereby supporting the seat unit in a "floating" manner above the ground. The present invention will be explained below using this seat unit and its improved solutions as examples.

[0053] The base unit 1 includes a fixing plate 12 extending longitudinally along the front-to-back direction of the movable seat, and a base crossbeam 13 extending transversely between the two fixing plates 12. The fixing plates 12 are fixedly connected to the inner side of the armrest portion by means of riveting, threading, or the like, and the fixing plates 12 and the base crossbeam 13 are fixedly connected by an angled connecting strip 11. Here, the fixing plates 12, connecting strip 11, and the base crossbeam 13 are, for example, separate components that can be fixedly connected. However, two or more of the fixing plates 12, connecting strip 11, and the base crossbeam 13 may also be constructed as an integral component.

[0054] However, alternatively, in an embodiment not shown, the base unit 1 may also have other structures, such as a base unit constructed as an iron frame floor-standing type, wherein the fixing plate 12 is not fixedly attached to the inner side of the armrest portion, but a plurality of legs for supporting on the ground extend downward from the fixing plate 12; or the base unit does not have the fixing plate 12, but includes a rotating bracket rotatably supported on the ground.

[0055] The seat unit 2 includes a pair of seat longitudinal beams 21 extending in the front-rear direction of the seat unit and for attaching a seat portion (not specifically shown).

[0056] To install the seat, in a simple embodiment, the seat can be mounted on the seat longitudinal beams 21 using a seat frame (also not shown). The seat frame is fixedly connected to the seat and, on the other hand, is connected at its bottom to the top surface of the seat longitudinal beams 21. The seat frame can be made of a hard material, preferably wood, for example. Furthermore, the seat frame can also be made of a metal material and can preferably be constructed integrally with the seat longitudinal beams.

[0057] The rear portion of the seat longitudinal beam 21 includes two upwardly directed protrusions, namely a front seat frame protrusion 21 a and a rear seat frame protrusion 21 b . Furthermore, the seat unit 2 further includes two seat frame attachment plates 22 extending downwardly from the seat longitudinal beam 21 .

[0058] In this embodiment, the seat frame attachment plate 22 is fixedly connected to the seat longitudinal beam 21 ; however, in an embodiment not shown, the seat frame attachment plate 22 is constructed as a component integrally constructed with the seat longitudinal beam 21 .

[0059] The seat unit 2 is movably connected with respect to the base unit 1 by means of a linkage mechanism. However, in an alternative embodiment, the seat unit 2 may also be configured to always maintain a constant relative position with respect to the base unit 1.

[0060] The linkage mechanism may include a plurality of connecting rods. Figure 2 and Figure 3 As shown, the linkage mechanism includes at least a front swing link 17, a rear swing link 18, a secondary front swing link 17a, and a secondary rear swing link 18a. The lower ends of the front swing link 17 and the rear swing link 18 are respectively pivotally connected to the fixed plate 12. The upper end of the secondary front swing link 17a is pivotally connected to the middle portion of the front swing link 17, and the lower end of the secondary front swing link 17a is pivotally connected to the lower end of the seat frame attachment plate 22. The upper end of the secondary rear swing link 18a is pivotally connected to the middle portion of the rear swing link 18, and the lower end of the secondary rear swing link 18a is pivotally connected to the lower end of the seat frame attachment plate 22. Furthermore, the linkage mechanism may further include at least an intermediate link 19a, the rear end of which is pivotally connected to the middle portion of the secondary rear swing link 18a, and the front end of which is pivotally connected to the top end of the front swing link 17. Thus, the seat unit 1 is suspended and supported on the fixed plate 12 via the linkage mechanism.

[0061] The backrest unit 3 is designed to accommodate a backrest (not specifically shown) of a seat unit.

[0062] Preferably, the backrest unit 3 is configured to be movable relative to the seat unit 2 ; however, in an embodiment not shown, the backrest unit 3 may also be configured to always maintain a constant relative position relative to the seat unit 2 .

[0063] Preferably, Figures 1 to 3 and Figure 13 、 Figure 14 In the illustrated embodiment, the backrest unit 3 includes a backrest bracket 31 for attaching a backrest, a first backrest link 32, and a second backrest link 33. The backrest bracket 31 is generally L-shaped, with its front end pivotally connected relative to the seat longitudinal beam 21. The front end of the backrest bracket 31 is pivotally connected to the front seat frame protrusion 21a. The second backrest link 33 is configured as a bell crank member with three pivot points: a pivot point located in the middle of the bell crank member and two pivot points located at each end of the bell crank member. Thus, the upper end of the second backrest link 33 is pivotally connected to the lower end of the first backrest link 32. The upper end of the first backrest link 32 is pivotally connected to the middle of the backrest bracket 31. The second backrest link 33 is pivotally connected to the rear seat frame protrusion 21b via its central pivot point. Furthermore, the backrest unit 3 further comprises an auxiliary backrest link 34 , one end of which is connected to the lower end of the second backrest link 33 , and the other end of which is pivotally connected to the base unit 1 , for example, preferably to the connecting bar 11 .

[0064] In this embodiment, as the seat unit 2 moves in the front-to-back direction of the chair unit, the backrest bracket 31 accordingly reclines and tilts forward. For example, when the seat unit 2 moves forward, the front end of the backrest bracket 31, which is hinged to the seat longitudinal beam 21, moves forward. Simultaneously, the second backrest link 33 rotates about its pivot point with the rear seat frame protrusion 21b and moves forward as a whole, causing the backrest bracket 31 to pivot rearward about its pivot point with the seat frame front protrusion 21a, thereby reclining the attached backrest.

[0065] Figures 5 to 12 The leg unit 4 according to the present invention is shown alone.

[0066] The leg unit 4 includes a pair of leg longitudinal beams 40, a leg cross beam 41 transversely connected between the leg longitudinal beams 40, a pair of leg sliding rods 42, and a leg rest 43 connected to the leg sliding rods, wherein the leg sliding rods 42 and the leg longitudinal beams 40 can cooperate in a sliding and guiding manner, so that the leg sliding rods 42 can drive the leg rest 43 to move along the leg longitudinal beams 40 in the front and rear direction of the seat unit, so that the leg unit 4 can Figure 6 and Figure 7 The retracted position shown is the same as Figure 8 and Figure 9 To achieve synchronization of the movement of the leg sliding rods 42, a guide beam 44 is transversely connected between the leg sliding rods 42. Preferably, the connection between the leg sliding rods 42 and the guide beam 44 is achieved by welding, riveting, screw connection, etc.

[0067] The leg cross beam 41 is fixedly connected to the leg longitudinal beam 40 at its two ends. The connection between the leg longitudinal beam 40 and the leg cross beam 41 is preferably achieved by welding, riveting, threaded connection, etc., so that a shape-stable leg frame is formed by the leg longitudinal beam 40 and the leg cross beam 41.

[0068] The sliding guidance between the leg longitudinal beam 40 and the leg sliding rod 42 can be achieved in various ways.

[0069] For example, Figures 7 to 9 In the illustrated embodiment, the leg longitudinal beam 40 is configured as a sliding channel member, wherein a longitudinally extending, through-going guide groove 40a is defined in the leg longitudinal beam 40 as a leg guide. Accordingly, the leg sliding rod 42 includes at least one roller 42a at its rear end. The roller 42a is rollably engaged in the guide groove 40a, thereby enabling the leg sliding rod 42 to slide and guide along the sliding direction R1 within the leg longitudinal beam 40.

[0070] exist Figure 10 and Figure 11 In the illustrated alternative embodiment, the leg longitudinal beam 40 is configured as a slide rail member, wherein the leg longitudinal beam 40 includes a guide rail 40b having a C-shaped cross section as a leg guide. Accordingly, the leg sliding rod 42 includes a slider 42b at its rear end. The slider 42b is positively and movably engaged in the guide rail 40b, thereby enabling the leg sliding rod 42 to slide and guide in the leg longitudinal beam 40 along the sliding direction R1.

[0071] The legrest 43 is generally constructed as a plate-like member extending over at least part of the transverse width of the seat unit. The leg sliding rod 42 is slidably embedded in the leg longitudinal beam 40 at its rear end and connected to the legrest 43 at its front end. Preferably, the leg sliding rod 42 is connected to the legrest 43 by means of a legrest connecting rod 45 arranged at its front end. In particular, Figure 7 and Figure 12 As shown, the legrest connecting rod 45 is constructed to have an L-shaped cross-section, one side of which is pivotally connected to the leg sliding rod 42, and the other side is fixedly connected to the legrest 43, for example, fixedly connected to the legrest 40 by riveting, threading, welding, etc.

[0072] Particularly preferably, Figure 12 As shown, the leg unit 4 further includes a restoring member 46. In this embodiment, the restoring member 46 is configured as a torsion spring, which acts between the leg sliding rod 42 and the legrest link 45. Under the biasing action of the restoring member 46, the legrest link 45 tends to flip forward with its end away from the leg sliding rod 43.

[0073] like Figure 7As shown, the leg unit 4 is in the retracted position, and the legrest link 45 is folded at the front end of the leg longitudinal beam 40, wherein the inner side of the legrest 43 abuts against the front end of the leg longitudinal beam 40, thereby overcoming the restoring force applied by the restoring member 46 (not shown) and maintaining its retracted position. Figure 8 As shown, the leg unit 4 is then in the extended position, wherein the leg rest 43 is spread forward relative to the leg longitudinal beam 40 .

[0074] During the process of the leg unit 4 changing from its retracted position to its extended position, the leg sliding rod 42 slides forward, so that the leg rest 43 and the leg rest connecting rod 45 attached thereto are disengaged from the stop on the leg longitudinal beam 40. Under the biasing action of the reset member 46, the leg rest connecting rod 45 flips forward with its end away from the leg sliding rod 41, thereby driving the leg rest 40 to flip.

[0075] When the leg unit 4 is moved from its extended position to its retracted position, the leg sliding rod 42 slides backward, driving the legrest connecting rod 45 and the legrest 43 to slide backward. When the legrest 43 abuts against the front end of the leg longitudinal beam 40 with its inner side, the legrest 43 overcomes the restoring force of the restoring member 46 and flips downward, thereby moving to its retracted position.

[0076] Of course, as an alternative, for example in an unillustrated embodiment, the return member 46 may be omitted. Accordingly, a continuous exterior trim, such as a sofa cover, covers both the seat portion and the legrest of the chair unit. During the extension of the leg unit 4, the distance between the legrest 43 and the leg cross member 41 increases. Under the tension of the exterior trim, the legrest 43 shifts from its original position against the leg longitudinal member 40 in the retracted position to a forwardly extended position in the extended position.

[0077] In addition, the leg unit 4 further comprises a leg actuator 47, wherein the leg actuator is preferably configured as a linear actuator acting between the leg cross beam 41 and the guide cross beam 44. Figure 5 and Figure 6 As shown, the leg actuator 47 includes a motor head 471, a motor guide rail 472, and a motor slider 473 that can move along the motor guide rail 472. The motor head 471 is hinged to the leg crossbeam 41 via a motor bracket 471a, and the motor slider 473 is fixedly connected to the guide crossbeam 44. By adjusting the leg actuator 47, the distance between the motor slider 473 and the motor head 471 changes, thereby driving the guide crossbeam 44 to increase or decrease the distance relative to the leg crossbeam 41, thereby realizing the transformation of the leg unit 4 between its retracted position and extended position.

[0078] As an alternative, the motor head 471 may be fixedly connected to the leg crossbeam 41 , and the motor slider 473 may be pivotally connected to the guide crossbeam 44 by means of a bracket with a rotating shaft.

[0079] Since the leg actuator 47 is not operatively connected to the seat unit 2 or the backrest unit 3 , adjustment of the leg actuator 47 does not affect the postures of the seat unit 2 and the backrest unit 3 .

[0080] The leg unit 4 is constructed as a whole in a modular manner. As previously described, the two leg longitudinal beams 40 and the leg cross beam 41 form a dimensionally stable leg frame. The movable components of the leg unit 4, such as the leg sliding rods 42, the guide cross beam 44 connected between the leg sliding rods 42, the leg rest connecting rods 45 connected to the leg sliding rods 42, and the leg rest 43, if necessary, are movably connected to the leg frame. The leg unit is a relatively independent unit, making it widely applicable to various types of seat units.

[0081] To mount the leg unit 4, at least one mounting tab can be provided on the leg frame. This mounting tab allows the leg unit 4 to be mounted to the seat unit of the chair unit, for example, on the seat frame or directly on the seat frame longitudinal beam 40, by means of riveting, screwing, or the like. The mounting tab defines a common plane, thereby preventing interference with the movement of other components of the chair unit. Preferably, the mounting tab can be configured as an integral component with respect to the leg longitudinal beam 40, or as a component fixedly connected to the leg longitudinal beam 40, for example, by welding, riveting, or screwing.

[0082] Preferably Figures 4 to 14 As shown, the leg longitudinal beam 40 includes at least two mounting tabs, namely a front mounting tab 48a and a rear mounting tab 48b located at the front and rear ends thereof, respectively. In this embodiment, the mounting tabs are respectively constructed as bent members protruding inward from the front and rear ends of the leg longitudinal beam 40 and have rivet holes or threaded holes for rivets or bolts to pass through. The front mounting tab 48a and the rear mounting tab 48b together define a mounting plane E0. The leg guide portion of the leg longitudinal beam 40, such as Figure 9 The guide slot 40a shown extends obliquely relative to the mounting plane E0, forming an angle α therebetween. Thus, when the leg unit 4 transitions from the retracted position to the extended position, the leg slide bar 42 slides forward along the upwardly inclined guide portion, thereby enabling the legrest 43 to reach a greater height in the extended position, preferably above the height of the backrest, achieving a "zero-gravity" posture.

[0083] Preferably Figure 5 As shown, the minimum thickness D1 of the leg unit 4 can be 10 cm. The thickness D1 is measured perpendicular to the sliding direction R1. Figure 5The leg guide of the illustrated leg unit 4 is oriented obliquely relative to the mounting plane E0, meaning that the sliding direction R1 is also oriented obliquely relative to the mounting plane E0. As viewed in the sliding direction R1, the minimum thickness D1 of the leg unit 4 is the distance between a first plane E1 extending past the front mounting tab 48a and parallel to the sliding direction R1, and a second plane E2 extending past the lower edge of the leg actuator 47 and parallel to the sliding direction R1. This achieves a flat, compact design for the leg unit 4 as a whole.

[0084] In such Figures 2 to 4 In the embodiment of the seat unit shown, a Figures 7 to 9 The leg unit 4 is shown.

[0085] In this embodiment, the seat portion (not shown) is connected directly or via a seat frame (not shown) to the top surface of the seat longitudinal member 21. The leg unit 4 is fixed to the seat portion or the seat frame via a front mounting tab 48a and a rear mounting tab 48b on the leg longitudinal member 40. The leg guide portion of the leg longitudinal member 40 is configured as a guide groove 40a, which is oriented obliquely with respect to the mounting plane defined by the front mounting tab 48a and the rear mounting tab 48b. Figure 7 The retracted position shown changes to Figure 8 During the extended position shown, the leg slide bar 42 slides forward and upward along the upwardly inclined guide channel 40a.

[0086] The seat unit also includes a seat actuator 50. This seat actuator 50 is preferably configured as a linear actuator, comprising a motor head acting between the base unit 1 and the seat unit 2 and an actuator rod that is retractable relative to the motor head. The motor head of the seat actuator 50 can be mounted on the base unit 1, preferably on the base crossbeam 13; the actuator rod of the seat actuator 50 can be mounted on a suitable component of the seat unit 2. The seat actuator 50 enables the seat longitudinal beam 21 of the seat unit to move forward and backward, thereby driving the backrest to tilt.

[0087] The seat actuator 50 and the leg actuator 47 can be operated independently of each other, so that the seat unit 2 and the backrest unit can be adjusted independently of the leg unit 4. Thus, the seat unit can be changed between the sitting position, the TV position and the lying position by the joint action of the seat actuator 50 and the leg actuator 47.

[0088] In such Figures 13 and 14 In the embodiment of the seat unit shown, a Figures 10 and 11 The leg unit 4 is shown.

[0089] In this embodiment, the seat part (not shown) is connected directly or via a seat frame (not shown) to the top surface of the seat longitudinal beam 21. The leg unit 4 is fixed to the seat part or the seat frame via the front mounting tab 48a and the rear mounting tab 48b on the leg longitudinal beam 40. Figures 2 to 4 In the embodiment shown, the leg guide portion of the leg longitudinal beam 40 is constructed as a guide rail 40b, and the guide groove 40a is oriented obliquely relative to the installation plane defined by the front installation lug 48a and the rear installation lug 48b. Figure 10 The retracted position shown changes to Figure 11 During the extended position shown, the leg slide bar 42 slides forward and upward along the upwardly inclined guide channel 40a.

[0090] like Figure 13 The seat unit shown includes a leg unit 4 in a retracted position, wherein, when the front end of the seat longitudinal beam 21 is further forward than the leg longitudinal beam 40, the inner side of the leg unit's not shown leg rest 43 does not abut against the front end of the leg longitudinal beam 40, but abuts against the front end of the seat longitudinal beam 21.

[0091] As mentioned above, the leg unit 4 is an independent unit of modular construction and can be applied to a variety of different seat types. The seat unit described in the embodiment is only for illustrative purposes, and the scope of application of the leg unit is not limited to this.

Claims

1. A leg unit for a movable seat unit, the seat unit comprising a seat unit with a seat portion, characterized in that The leg unit comprises: - a leg frame comprising at least a pair of leg longitudinal beams extending longitudinally in the front-rear direction of the seat unit and a leg cross beam extending transversely between the leg longitudinal beams; - a pair of leg sliding rods movable in the front-to-rear direction of the seat unit, wherein the leg sliding rods are used to attach the leg rest; The leg sliding rod is slidably connected to the leg frame, so that the leg unit can be transformed between a retracted position and an extended position. In the retracted position, the leg rest is folded at the front end of the leg longitudinal beam, and in the extended position, the leg rest is unfolded forward relative to the leg longitudinal beam, and the leg unit is installed under the seat part with the help of the leg frame.

2. The leg unit according to claim 1, wherein: Both ends of the leg cross beam are fixedly connected to the leg longitudinal beam by welding, riveting or threading.

3. The leg unit according to claim 1, wherein: The leg cross member and the leg longitudinal member are constructed in one piece.

4. The leg unit according to claim 1, wherein: The leg longitudinal beam includes a leg guide in which the leg sliding rod is slidably supported.

5. The leg unit according to claim 4, characterized in that The leg guide portion is configured as a through guide groove provided on the leg longitudinal beam, and the leg sliding rod comprises at least one roller which is rollably engaged in the guide groove, thereby enabling the leg sliding rod to be slidably supported in the leg longitudinal beam.

6. The leg unit according to claim 5, characterized in that The leg guide is configured as a guide rail provided on the leg longitudinal beam, and the leg sliding rod comprises a slider which is movably engaged in the guide rail in a form-fitting manner, thereby enabling the leg sliding rod to be slidably supported in the leg longitudinal beam.

7. The leg unit according to claim 4, wherein: The leg rail includes at least one mounting tab, with which the leg frame is connected to the seat unit.

8. The leg unit according to claim 7, characterized in that A mounting plane is defined by the mounting web, wherein the leg guide extends obliquely relative to the mounting plane.

9. The leg unit according to claim 1, wherein: The leg unit further includes a legrest connecting rod arranged between the leg sliding rod and the legrest, wherein the legrest connecting rod is pivotally connected to the front end of the leg sliding rod and fixedly connected to the legrest.

10. The leg unit according to claim 9, characterized in that The leg unit further comprises a reset member, wherein the reset member acts between the leg sliding rod and the legrest connecting rod, and the end of the legrest connecting rod facing away from the leg sliding rod can be flipped forward by means of the reset member.

11. The leg unit according to claim 10, characterized in that During the transformation of the leg unit from the retracted position to the extended position, the leg sliding rod slides forward along the leg guide portion of the leg longitudinal beam, and the restoring member causes the legrest link together with the legrest to flip forward.

12. The leg unit according to claim 10, wherein: During the process of the leg unit changing from the extended position to the retracted position, the leg sliding rod slides backward along the leg guide portion of the leg longitudinal beam, so that the leg rest is stopped by the front end portion of the leg longitudinal beam or the front end portion of the seat unit of the seat unit, thereby overcoming the restoring force of the restoring member and flipping backward.

13. The leg unit according to claim 10, wherein: The reset element includes a torsion spring.

14. The leg unit according to claim 1, wherein The leg unit further includes a leg actuator, which acts between the leg frame and the leg sliding rod. The leg unit is transformed between a retracted position and an extended position by adjusting the leg actuator.

15. The leg unit according to claim 14, characterized in that The leg unit further includes a guide beam extending transversely between the pair of leg sliding rods, wherein the leg actuator acts between the leg beam and the guide beam.

16. The leg unit according to claim 15, characterized in that The leg actuator is configured as a linear actuator and includes a motor head, a motor guide rail, and a motor slider movable along the motor guide rail.

17. The leg unit according to claim 16, wherein: The motor head is hinged to the leg crossbeam by means of a motor bracket.

18. The leg unit according to claim 16, wherein: The motor slide is hinged to the guide beam by means of a motor bracket.

19. The leg unit according to claim 14, wherein: The minimum thickness of the leg unit is no more than 10 cm.

20. A movable seat unit, characterized in that: The seating unit comprises a leg unit as claimed in any one of the preceding claims.

21. The seating unit of claim 20, wherein: The seat unit comprises: - base unit; - a seat unit for attaching a seat portion; The seat unit includes a pair of seat longitudinal beams extending in the front-rear direction of the seat unit, the seat portion is connected to the seat longitudinal beams via a seat frame, and the leg unit is connected to the seat frame.

22. The seating unit of claim 21, wherein: The seat longitudinal beam is movable relative to the base unit in a front-rear direction of the seat unit.

23. The seating unit of claim 21, wherein: The seat unit further includes an outer trim covering both the seat portion and the leg rest, wherein the outer trim is tensioned during the process of the leg unit being transformed from the retracted position to the extended position, thereby causing the leg rest to be deployed forward.

24. The seating unit of claim 21, wherein: The seating unit further comprises a backrest unit for attaching a backrest.

25. The seating unit of claim 24, wherein: The backrest unit is connected to the rear portion of the seat longitudinal beam and includes a backrest bracket for attaching a backrest, wherein the backrest bracket is pivotally connected to the seat longitudinal beam to achieve tilting rotation of the backrest.

26. The seating unit of claim 24, wherein: The backrest unit further includes a first backrest link and a second backrest link, wherein the first backrest link is connected between the backrest bracket and the second backrest link, and the second backrest link is pivotally connected to the first backrest link, the seat longitudinal beam and the base unit respectively, so that when the seat longitudinal beam moves forward, the highest point of the backrest bracket moves forward.

27. The seating unit of claim 22, wherein: The seat unit further includes a seat actuator acting between the base unit and the seat unit, and the seat frame longitudinal beam is moved along the front-rear direction of the seat unit by adjusting the seat actuator.

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